| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 104 === In this thesis, we construct a selective laser melting (SLM) system based on a powder bed fusion additive manufacturing and can be applied to controllable single line multi-layered metal microstructures. The single track microstructure is built up with multi-layered single track, therefore, we began with the first layer single track formed by laser power 24 watt and compared with the forming single track in different preheating temperature. The next step of experiments was going to investigate the influence of the heat transfer on forming different single track multi-layered microstructures. The contour of fabricated structure was measured by scanning electron microscope (SEM), we could get the relationship between the width of tracks and the scanning speed in the different height of structure. We found that the track width is increased as the height of the structure is increased.
According to the experiment results, we could form the first layer with stable parameter and build up controllable structure by lower heat transfer effect in high layer. As higher structure, the thinner track would be form stably. As result, we could made a thin-wall structure with aspect ratio about 5.5. Finally, the lightweight design structure could be build up by controllable single track multi-layered microstructures.
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